Confess With You Mouth That Jesus Is Lord.

The sum of the gospel, which is plain and easy enough. Observe, First, What is promised to us: Thou shalt be saved. It is salvation that the gospel exhibits and tenders-saved from guilt and wrath, with the salvation of the soul, an eternal salvation, which Christ is the author of, a Saviour to the uttermost.

Secondly, Upon what terms.
Two things are required as conditions of salvation: Confessing the Lord Jesus-openly professing relation to him and dependence on him, as our prince and Saviour, owning Christianity in the face of all the allurements and affrightments of this world, standing by him in all weathers. Our Lord Jesus lays a great stress upon this confessing of him before men; see Matthew 10:32, 33. It is the product of many graces, evinces a great deal of self-denial, love to Christ, contempt of the world, a mighty courage and resolution. It was a very great thing, especially, when the profession of Christ or Christianity hazarded estate, honour, preferment, liberty, life, and all that is dear in this world, which was the case in the primitive times. Believing in the heart that God raised him from the dead. The profession of faith with the mouth, if there be not the power of it in the heart, is but a mockery; the root of it must be laid in an unfeigned assent to the revelation of the gospel concerning Christ, especially concerning his resurrection, which is the fundamental article of the Christian faith, for thereby he was declared to be the Son of God with power, and full evidence was given that God accepted his satisfaction. - Matthew Henry